Sahih al-Bukhari 6046
Sahih al-Bukhari · Book 78: Good Manners and Form (Al-Adab) · Calling bad names and cursing
Narrated Anas:
حَدَّثَنَا مُحَمَّدُ بْنُ سِنَانٍ ، حَدَّثَنَا فُلَيْحُ بْنُ سُلَيْمَانَ ، حَدَّثَنَا هِلاَلُ بْنُ عَلِيٍّ ، عَنْ أَنَسٍ ، قَالَ لَمْ يَكُنْ رَسُولُ اللَّهِ صلى الله عليه وسلم فَاحِشًا وَلاَ لَعَّانًا وَلاَ سَبَّابًا، كَانَ يَقُولُ عِنْدَ الْمَعْتَبَةِ " مَا لَهُ، تَرِبَ جَبِينُهُ " .
Allah's Messenger (ﷺ) was neither a Fahish (one who had a bad tongue) nor a Sabbaba (one who abuses others) and he used to say while admonishing somebody, "What is wrong with him? May dust be on his forehead!"